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Optical Glass Filters
Al Luebbers, our founder, collected glass. Not glass like you'd find on a knick-knack shelf, but optical glass. Lenses, prisms, reticles and filters, for example. Focus on the filters. Many of his filters came out of military surplus, and this is for-real stuff. We mean many are solid dyed optical glass, ground and polished to flatness standards that were probably excessive. Others are from the old days in photographic optics, and their standards were even tighter than your militaristic Uncle's. We've found that photographers, artists, and optical designers still have an occasional need for good glass filters, so we're making a list of some goodies. As always, don't be timid about calling for quotes on quantities. If we have 'em, we'll sell 'em. Just don't sell them back. Please!
| DIAM.or SIZE (mm) | CENTER THICK (mm) | |||
|---|---|---|---|---|
 |
3477 FILTER, AMBER | 26 | 1.5 | |
|
3492 FILTER, AMBER | 30 | 2.3 | |
|
3480 FILTER, NEUTRAL | 26 | 1.5 | |
|
3490 FILTER, NEUTRAL | 30 | 2.3 | |
|
3510 FILTER, NEUTRAL | 50x54 | 3.1 | |
|
3512 FILTER, NEUTRAL | 67x70 | 4.1 | |
|
3458 FILTER, RED | 6 | 1.4 | |
|
3464 FILTER, TYPE A | 9 | 1.8 | |
|
3470 FILTER, YELLOW | 18x18 | 1.6 |
Ground Glass
One wiseacre assumed we meant any package leaving our shipping room that once had a glass object in it. That is a malicious rumor. . . Ground glass is thin plate glass, the surface of which has been physically ground or acid-etched to create a grainy, grayish, opaque surface. Use it to produce an image from a lens or lens system. Even a simple magnifier, held between the ground glass and, say, a window, will produce an image of the window scene on the ground glass. Ground glass has another magical property: it is opaque to any object viewed at a distance, but not if that object is in direct contact with the glass surface. A necessary element of your optical education. #2728 (square) is 2"sq x 1/32" thick. #2610 (rectangular) is 3-1/2" x 4-3/8" x 1/16" thick.
|
2610 RECT. GND. GLASS | |
|
2728 SQUARE GND. GLASS |
Polarization Possibilities
Experience the endless educational and entertaining possibilities of polarization with your own polarizing film, direct from America's polarization professionals, the Polaroid® people. These may have slight scratches so they are perfect for assorted light experiments for science fairs, home schooling, etc. You get a piece approximately 11-1/2" x 6-1/2" x 12.5 mils thick.
|
40019 11-1/2" POLARIZING FILM |
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